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O RAY [1 record]

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Alphabetical list of terms

Record 1 1977-05-19

English

Subject field(s)
  • Mineralogy
OBS

In uniaxial crystals, the ray which vibrates perpendicular to the optic axis; the "ordinary ray".

French

Domaine(s)
  • Minéralogie
OBS

Quand [un] rayon de lumière frappe, par exemple, un rhomboèdre de calcite ou spath d'Islande, aussi bien perpendiculairement qu'obliquement, il se divise en deux rayons. Un rayon, appelé "rayon ordinaire", se comporte comme si le cristal était isotrope, tandis que l'autre, appelé "rayon extraordinaire", dévie suivant des lois propres.

Spanish

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